Python 串口通讯

摘要：https://www.cnblogs.com/liuyang92/category/1058499.html

pyserial module: https://github.com/tbusf/pyserial

Python使用pyserial进行串口通信：http://blog.csdn.net/log1100/article/details/54380325

串口通讯的python模块——pySerial :http://blog.csdn.net/dainiao01/article/details/5885122

Parameters for the Serial class

ser = serial.Serial(
port=None,              # number of device, numbering starts at
# zero. if everything fails, the user
# can specify a device string, note
# that this isn't portable anymore
# if no port is specified an unconfigured
# an closed serial port object is created
baudrate=9600,          # baud rate
bytesize=EIGHTBITS,     # number of databits
parity=PARITY_NONE,     # enable parity checking
stopbits=STOPBITS_ONE,  # number of stopbits
timeout=None,           # set a timeout value, None for waiting forever
xonxoff=0,              # enable software flow control
rtscts=0,               # enable RTS/CTS flow control
interCharTimeout=None   # Inter-character timeout, None to disable
)

Methods of Serial instances

open()                  # open port
close()                 # close port immediately
setBaudrate(baudrate)   # change baud rate on an open port
inWaiting()             # return the number of chars in the receive buffer
read(size=1)            # read "size" characters
write(s)                # write the string s to the port
flushInput()            # flush input buffer, discarding all it's contents
flushOutput()           # flush output buffer, abort output
sendBreak()             # send break condition
setRTS(level=1)         # set RTS line to specified logic level
setDTR(level=1)         # set DTR line to specified logic level
getCTS()                # return the state of the CTS line
getDSR()                # return the state of the DSR line
getRI()                 # return the state of the RI line
getCD()                 # return the state of the CD line

Attributes of Serial instances
readonly

portstr                 # device name
BAUDRATES               # list of valid baudrates
BYTESIZES               # list of valid byte sizes
PARITIES                # list of valid parities
STOPBITS                # list of valid stop bit widths

New values can be assigned to the following attributes, the port will be reconfigured, even if it’s opened at that time:(即使是打开的情况下也会重新配置???liub)

port                    # port name/number as set by the user
baudrate                # current baud rate setting
bytesize                # byte size in bits
parity                  # parity setting
stopbits                # stop bit with (1,2)
timeout                 # timeout setting
xonxoff                 # if Xon/Xoff flow control is enabled
rtscts                  # if hardware flow control is enabled

居然还有这么多好东西,看看下面:

TCP/IP – serial bridge

This program opens a TCP/IP port. When a connection is made to that port (e.g. with telnet) it forwards all data to the serial port and vice versa.

This example only exports a raw socket connection. The next example below gives the client much more control over the remote serial port.

The serial port settings are set on the command line when starting the program.
There is no possibility to change settings from remote.
All data is passed through as-is.

打开一个python shell

import serial导入模块

然后就可以用了

ser = serial.Serial(0) 是打开第一个串口

print ser.portstr 能看到第一个串口的标识，windows下是COM1

ser.write(“hello") 就是往串口里面写数据

ser.close() 就是关闭ser表示的串口

ser.open() 会打开这个串口

ser = serial.Serial('COM1', 115200) 来设置波特率，当然还有专门的函数

data = ser.read()可以读一个字符

data = ser.read(20) 是读20个字符

data = ser.readline() 是读一行，以/n结束，要是没有/n就一直读，阻塞。

data = ser.readlines()和ser.xreadlines()都需要设置超时时间

ser.baudrate = 9600 设置波特率

ser 来查看当前串口的状态

ser.isOpen() 看看这个串口是否已经被打开

import pyserial 
t=serial.Serial() 
t.port = 3 
t.baudrate = 115200 
t.open() 
t.write(chr(0x03)) #向串口输入ctrl+c

TCP/IP – serial bridge

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